Question

matching question
match the rule or principle to the step in the process of determining electron configuration.
instructions
aufbau principle
hunds rule
pauli exclusion principle
add electrons to orbitals of equal energy.
determine the lowest energy levels for the number of electrons in the atom in question.
assign spins to electrons in orbitals of equal energy.
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Explanation:

• The aufbau principle states that electrons occupy the lowest - energy orbitals available first. So, it is related to determining the lowest energy levels for electrons.
• Hund's rule requires that when filling orbitals of equal energy (degenerate orbitals), electrons are added singly first before pairing up. This is about adding electrons to equal - energy orbitals.
• The Pauli exclusion principle says that no two electrons in an atom can have the same set of four quantum numbers. When electrons are in equal - energy orbitals, their spins (a part of the quantum number description) must be assigned in a way that follows this principle (e.g., opposite spins when pairing).

Answer:

aufbau principle: Determine the lowest energy levels for the number of electrons in the atom in question.
Hund's rule: Add electrons to orbitals of equal energy.
Pauli exclusion principle: Assign spins to electrons in orbitals of equal energy.